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Home » Class 9 » Structure of an atom » J.J. Thomson Model of an Atom

J.J. Thomson Model of an Atom

Last Updated on July 3, 2023 By Mrs Shilpi Nagpal

Question 1 Describe Thomson’s model of an atom?

Question 2 Which subatomic particle was not present in Thomson’s model of an atom?

Question 3 Why Thomson’s model is called as Plum pudding model of an atom?

Structure of an Atom

Dalton atomic theory suggested that atoms are indivisible(could not be broken into smaller particles)

But the discovery of subatomic particles inside an atom disproved this postulate of Dalton atomic theory.

After the discovery of these subatomic particles,it became necessary to find out how these particles are arranged inside the atoms.

J.J. Thomson was the first scientist to propose a model for structure of an atom.

Thomson model of an atom

Thomson Model of an atom

When J.J. Thomson proposed his model of the atom in 1903,then only electrons and protons were known to be present in the atom.

According to Thomson Model of an atom :

1) An atom consist of a sphere of positive charge with negatively charged electrons embedded in it.

2) The positive and negative charges in an atom are equal in magnitude, due to which an atom is electrically neutral.IT has no overall positive and negative charge.

Thomson model of the atom is similar to that of a christmas pudding. The electrons embedded in a sphere of positive charge are like the dry fruits in a spherical christmas pudding. We can also compare Thomson’s model of an atom to a watermelon. The red edible part of watermelon represents the sphere of positive charge whereas the black seeds embedded in watermelon are like electrons.

Filed Under: Class 9, Structure of an atom Tagged With: plum pudding model, structure of an atom, thomson model of an atom

About Mrs Shilpi Nagpal

Author of this website, Mrs. Shilpi Nagpal is MSc (Hons, Chemistry) and BSc (Hons, Chemistry) from Delhi University, B.Ed. (I. P. University) and has many years of experience in teaching. She has started this educational website with the mindset of spreading free education to everyone.

Reader Interactions

Comments

  1. Vishal Adhikari says

    August 19, 2018 at 7:42 pm

    Thank you so much

  2. Maadesh says

    April 25, 2019 at 8:46 pm

    Can you help me to do thomson model of atom as an project

  3. Sujan says

    August 2, 2019 at 5:35 am

    It is easy. Just draw A big circle
    And just draw many electrons inside.andwhere you can show that positive eletrons are sphere and electrons are embedded in it.

  4. Mousumi says

    November 6, 2019 at 8:55 pm

    Thank you for the help

  5. Sheikh seerat says

    June 18, 2020 at 1:21 pm

    ThANK U…..IT IS VERY EASY TO UNDERSTAND…

  6. Surya says

    November 1, 2020 at 6:05 am

    Thanks
    It’s very easy

  7. Gurshan says

    November 11, 2020 at 2:34 pm

    Thanks it is very easy

  8. P. Abhinaya says

    November 22, 2020 at 6:17 pm

    Thank u so much…
    As it is very helpful & easy to learn. Thank u for the easy explanation…

  9. Gaurav says

    February 4, 2021 at 6:18 am

    Thanks, it is very easy

  10. vishnunanda says

    September 18, 2021 at 4:01 pm

    thank u so much .

  11. Ashwin Rajkumar says

    December 27, 2021 at 9:39 pm

    Thank you. It was very helpful

  12. Anukalp soni says

    January 10, 2023 at 6:09 am

    Thanks mam

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